2015 Search Engine Ranking Factors Study: Moz

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Here are the results of Moz's biannual Search Engine Ranking Correlation Study and Expert Survey, a.k.a. Ranking Factors. Moz's Ranking Factors study helps identify which attributes of pages and sites have the strongest association with ranking highly in Google. The study consists of two parts: a survey of professional SEOs and a large correlation study. The analysis data is provided by SimilarWeb, Ahrefs, and DomainTools.

Moz's Ranking Correlation Study measures which attributes of pages and websites are associated with higher rankings in Google's search results. This means the analysis look at characteristics such as: Keyword usage, Page load speed, Anchor text...and over 170 other attributes. To be clear, the study doesn't tell us if Google actually uses these attributes in its core ranking algorithm. Instead, it shows which features of pages and sites are most associated with higher rankings. It's a fine, but important, distinction.

Here is the full findings: https://moz.com/search-ranking-factors